public class Example22 {
    public static void main(String[] args) {
        int[]arr;
        arr=new int[3];
        System.out.println("arr[0]"+arr[0]);
        System.out.println("arr[1]"+arr[1]);
        System.out.println("arr[2]"+arr[2]);
        System.out.println("数组的长度是"+arr.length);
    }
}
